TY - GEN
T1 - Double threshold digital relaying for cooperative wireless networks
AU - Liu, Kuang-Hao
PY - 2010/7/30
Y1 - 2010/7/30
N2 - Cooperative relaying has been shown as a promising approach to leverage the transmit diversity that is traditionally realized by installing multiple antennas on a single device. In digital relaying, one of the key issues is that relays might receive in error, resulting in error propagation to the destination. Despite error detection codes can be used to prevent error propagation, performing error detection algorithms incurs delay and processing overhead at relays. An alternative approach is to set a threshold value, whereby the relay forwards when the instantaneous signal-to-noise ratio (SNR) exceeds the threshold. Most existing threshold-based relaying schemes implicitly assume the relays are placed in the middle between the source and the destination, whereby a single threshold is applied to the source-relay channel for making the cooperation decision. In infrastructureless wireless networks, relays may be randomly distributed in the network and thus, the relaying scheme based on a single threshold may choose the relay with a weak one-hop channel to forward that degrades diversity combining. In this paper, a threshold digital relaying scheme based on double testing is proposed where both the source-relay and the relay-destination channels are tested to select the cooperating relays. The end-toend bit error rate (BER) performance is derived theoretically, and compared with simulation results. Different network topologies are considered to demonstrate the superior performance of the proposed double testing digital relaying scheme over the single testing schemes.
AB - Cooperative relaying has been shown as a promising approach to leverage the transmit diversity that is traditionally realized by installing multiple antennas on a single device. In digital relaying, one of the key issues is that relays might receive in error, resulting in error propagation to the destination. Despite error detection codes can be used to prevent error propagation, performing error detection algorithms incurs delay and processing overhead at relays. An alternative approach is to set a threshold value, whereby the relay forwards when the instantaneous signal-to-noise ratio (SNR) exceeds the threshold. Most existing threshold-based relaying schemes implicitly assume the relays are placed in the middle between the source and the destination, whereby a single threshold is applied to the source-relay channel for making the cooperation decision. In infrastructureless wireless networks, relays may be randomly distributed in the network and thus, the relaying scheme based on a single threshold may choose the relay with a weak one-hop channel to forward that degrades diversity combining. In this paper, a threshold digital relaying scheme based on double testing is proposed where both the source-relay and the relay-destination channels are tested to select the cooperating relays. The end-toend bit error rate (BER) performance is derived theoretically, and compared with simulation results. Different network topologies are considered to demonstrate the superior performance of the proposed double testing digital relaying scheme over the single testing schemes.
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U2 - 10.1109/VETECS.2010.5493700
DO - 10.1109/VETECS.2010.5493700
M3 - Conference contribution
AN - SCOPUS:77954902036
SN - 9781424425198
T3 - IEEE Vehicular Technology Conference
BT - 2010 IEEE 71st Vehicular Technology
T2 - 2010 IEEE 71st Vehicular Technology Conference, VTC 2010-Spring
Y2 - 16 May 2010 through 19 May 2010
ER -